Extension device



Aug. 4, 1931. T, NELSON 1,817,163

EXTENS ION DEVICE Filed Dec. 5. 1930 INVENTOR Patented Aug. 4, 1931 EXTENSION DEVEGE Application filed Becemher 5, 1220. Serial No. 500,29

This invention relates to a exaension device for a wrist watch strap; and has for its object to provide means by which an extension may be had by the unfoldin of parts hereof as disclosed in my Patent No. 1,739,680, dated December 17, 1929, and yet be thinner and of less built.

A further object of the invention is the provision of a readily releasable clamp for .he strap with other parts of the construction so arranged as to receive this clamp without its increasing the thickness of the device.

A still further object of the invention is the arrangement and shape of certain sections of the device to receive other sections, whereby different portions of the device are accommodated and the same is thinner in its final form.

With these and other objects in view, the invention consists of certain novel features of construction, as will be more fully described, and particularly point out in the appended claims.

In the accompanying drawings:

Fig. 1 is a top plan view of the extension device in folded position.

Fig. 2 is a plan view of the extension device in unfolded position looking at the top thereof.

Fig. 3 is a view similar to Fig. 2 looking at the under side of the device.

Fig. 4 is a central longitudinal section.

Fig. 5 is a central transverse section on line 55 of Fig. 1.

Fig. 6 is a perspective view partly broken away illustrating the folding arrangement of the different sections of the device.

In the use of wrist watch straps, extension devices are employ-ed for temporarily lengthening the encircling size of the strap to permit the same to be passed over the hand of the wearer without completely detaching and separating any of its iarts. In such a construction, it is desirable to provide a sufficient enlargement to pGIlflit the same to be easily removed from the h and, one of which is short in length and of minimum thickness for comfort upon the wrist; and in order to accomplish these desirabilities, I have provided several sections, the majority being of stocl: pl tes formed to lie clo. lv one u 101' the other, and I have I rrang'ed these sections so as not to fold the entire length of one another but to pile adjacent one end and 1 have then offset or formed a step in another of the sections to receive these folded sections on one side while a securing device for the strap is received on the other side of the plate, whereby to provid a structure of minimum thickness and one which can be formed thinner than the structure of my Patent No. 1.739.699, dated December 17, 1929; and the following a detailed description of the present embodiment of ti s invention illustrat the preferred means by winch these adv tageons results may be accomplish l"; ta reference cthe drawings. 10

nah one s 1.1 :inotl 1' part wich an QXLQ e iii-ed tl between. This extension device coinn a bodv section 12 and a carer section 13 s ably held together in fol-d d relation by 14 extending into rec 15 to incre the fri 'tional engagement l, v n side 16 and 17 of the channel helped see which telesc pe together. A pair of plates and 19 are hinged together as at 2-1). and hinged to the end of the body section 'lhtiti' tezl at 21, to fold theieinto. as in such as to ca a portion of tee le 12 placing the hin mediate the ends An. intermediate plate to'the body section an d 13 to join the two tog-ether to fold inwardly, as lustrated plate secas by a the plate tion is offs-3t step 23 tllf-ipf over the Fe portion 1.; i 51({12092 se'tion l'liLS form ng: a more compact arra 'igeir nt o" ons and providing a space over th a1 mounted claino .av ror gripping the strap the cover section of the device.

part 10 to hold the same in engagement with It will be as not to cont-act or pile one upon the other,

' while the offset section parts connecting the V ment of the parts and covering and body provides a means for re ceiving thestrap clamp and the other folding extension plates to permit closer engageproduce a device of the minimum thickness.

The foregoing description is directed solely towards the construction illustrated, but I desire it to be understood that I reserve the Y privilege of resorting to all the mechanical changes to which the device is susceptible,

the invention being defined and limited only by the terms of the appended claims.

I claim:

1. In a wrist strap, an extension device comprising a body section, a plate hinged to one end thereof to fold thereover a portion of the length thereof, a cover section, and an intermediate plate hinged to the other end of said body section and to said cover section connecting the two together and so formed intermediate its ends that one part of the plate is offset with reference to the other as to lie along said body section and over the top of said plate when folded over the body section.

2. Ina wrist strap, an extension device comprising a body section, a plurality of hingedly connected plates hinged to one end thereof to fold thereover a portion of the length thereof, a cover section, and an intermediate plate hinged to the other end of said body section and to said cover section connecting the two together and so formed intermediate its ends that one part of the plate is ofiset with reference to the other as to lie along said body section and over the top of said plates when folded over the body section.

3. In a wrist strap, an extension device comprising a body section, a plate hinged to one end thereof to fold thereover a portion of the length thereof, a cover section, a clamp on said cover section forattaching a wrist strap thereto, and an intermediate plate hinged to the other end of said body section and to said cover section connecting the two together and so formed intermediate'its ends that one part'of the plate is offset with ref erence to the other as to lie along saidbody section and receive said clamp on one side and the folded-in plate on the other side with the ofiset portion between said receiving portions, and means for securing an end of the strap to said plate.

4:. In a wrlst strap, an extension device comprising a body portion, a plurality of hingedly connected plates hinged to one end thereof to fold thereover a portion of the length thereof, a cover section, a clamp on said cover section for attaching one end of a wrist strap thereto, and an intermediate plate hinged to the other end of said body section and to said cover section connecting the two together and so formed intermediate its ends that one part of the plate is offset with reference to the other as to lie along said body section and receive said clamp on one side and the folded-in plates on the other side with the offset portion between said receiving portions, and means for securing the other end of the strap to one of said plates. 7

In testimony whereof I affiX my signature.

NELS T. NELSON. 

